METABOLISM 



603 



(See table above.) Continue this diet from one to four days. Collect the 

 urine in two-hour periods from 7 A. M. to n P. M. and in an eight-hour period be- 

 tween ii P. M. and 7 A. M. Analyze each specimen for total nitrogen, or urea. 

 At the end of this preliminary period add to the uniform diet, at one meal, a 

 weighed quantity (150-250 grams) of lean meat specially prepared and analyzed. 

 Collect the urine in periods as before and determine total nitrogen or urea. 

 Calculate the total nitrogen or urea excretion; tabulate the data and plot curves 



1 Percentage of fiber, included under carbohydrate: shredded wheat (1.7), Graham 

 crackers (1.5), oatmeal crackers (1.9), soda crackers (0.3), white bread (0.5), Graham 

 bread (i.i), boiled potatoes (0.6), doughnuts (0.7), ginger snaps (0.7), lettuce (0.7), 

 apples (1.2), bananas (i.o). 



2 Including salt. 



* Including salt and sugar. 



